/*
 * Copyright (c) 2014-2024 Stream.io Inc. All rights reserved.
 *
 * Licensed under the Stream License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    https://github.com/GetStream/stream-chat-android/blob/main/LICENSE
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.getstream.chat.android.ui.utils

import android.text.Spannable
import android.text.method.LinkMovementMethod
import android.text.style.URLSpan
import android.view.MotionEvent
import android.widget.TextView
import io.getstream.chat.android.models.User

internal abstract class TextViewLinkHandler : LinkMovementMethod() {
    override fun onTouchEvent(
        widget: TextView,
        buffer: Spannable,
        event: MotionEvent,
    ): Boolean {
        if (event.action != MotionEvent.ACTION_UP) return super.onTouchEvent(widget, buffer, event)

        var x = event.x.toInt()
        var y = event.y.toInt()

        x -= widget.totalPaddingLeft
        y -= widget.totalPaddingTop

        x += widget.scrollX
        y += widget.scrollY

        val layout = widget.layout
        val line = layout.getLineForVertical(y)
        val off = layout.getOffsetForHorizontal(line, x.toFloat())

        buffer.getSpans(off, off, URLSpan::class.java).firstOrNull()?.let { onLinkClick(it.url) }
        buffer.getSpans(off, off, UserSpan::class.java).firstOrNull()?.let { onUserClick(it.user) }
        return true
    }

    abstract fun onLinkClick(url: String)
    abstract fun onUserClick(user: User)
}
